A - Kyu in AtCoder

直接模擬

#define IO ios::sync_with_stdio(false);cin.tie();cout.tie(0) #define debug(x) cout<<#x<<": "<<x<<" " #include<iostream> #include<algorithm> using namespace std; int main() {IO;int x;cin>>x;//cout<<10-x/200<<endl;標準答案if(x<=599) cout<<'8'<<endl;else if(x<=799) cout<<'7'<<endl;else if(x<=999) cout<<'6'<<endl;else if(x<=1199) cout<<'5'<<endl;else if(x<=1399) cout<<'4'<<endl;else if(x<=1599) cout<<'3'<<endl;else if(x<=1799) cout<<'2'<<endl;else cout<<'1'<<endl;return 0; }

B - Magic 2

貪心

#define IO ios::sync_with_stdio(false);cin.tie();cout.tie(0) #define debug(x) cout<<#x<<": "<<x<<" " #include<iostream> #include<algorithm> using namespace std; int main() {IO;int a,b,c,k;cin>>a>>b>>c>>k;int cnt=0;while(b<=a){b*=2;cnt++;}while(c<=b){c*=2;cnt++;}if(cnt<=k) cout<<"Yes"<<endl;else cout<<"No"<<endl;return 0; }

C - Marks

比較一下就可以了

#define IO ios::sync_with_stdio(false);cin.tie();cout.tie(0) #define debug(x) cout<<#x<<": "<<x<<" " #include<iostream> #include<algorithm> using namespace std; const int N=200010; int a[N]; int main() {IO;int n,k;cin>>n>>k;for(int i=1;i<=n;i++) cin>>a[i];for(int i=k+1;i<=n;i++){if(a[i]>a[i-k]) cout<<"Yes"<<endl;else cout<<"No"<<endl;}return 0; }

D - Road to Millionaire

貪心：有錢就賺，低買高賣

#define IO ios::sync_with_stdio(false);cin.tie();cout.tie(0) #define debug(x) cout<<#x<<": "<<x<<" " #include<iostream> #include<algorithm> using namespace std; typedef long long ll; const int N=100; int a[N],n; int main() {IO;cin>>n;for(int i=1;i<=n;i++) cin>>a[i];ll res=1000;for(int i=1;i<=n;i++)if(i<=n&&a[i+1]>=a[i])res=res/a[i]*a[i+1]+res%a[i];cout<<res<<endl;return 0; }

只能做這些容易題~~嗨，要加油哦！

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